Alternative asset manager became billionaire with Wesley Edens and Michael Novogratz in February with public offering of Fortress Investment Group. Former Lehman Brothers partner Edens founded Fortress in 1998 with Robert Kauffman and Randal Nardone. Novogratz and Briger joined 4 years later. Today firm's private equity, hedge fund, real estate operations manage $43 billion. Shares down 45% since offering, keeping Kauffman and Nardone off The Forbes 400. Group sold minority interest to Japanese investment firm Nomura for $890 million last December; each has also earned more than $100 million in net cash payouts since 2005. Briger studied at Princeton, Wharton M.B.A. Spent 15 years at Goldman, now oversees Fortress' hybrid hedge fund.

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